Abstract
A gamma‐ray counter suitable for measuring the radioactivity of ordinary rocks “in situ” is described. This instrument represents a considerable improvement both in sensitivity and portability on an earlier instrument [Slack and Whitham, 1951].The instrument was calibrated against prepared standard radioactive concrete blocks and was used to investigate the radioactivity of the Kirkland Lake area in northern Ontario. The results on and around the Round Lake batholith in this area are compared with previous results over the same batholith. In addition, graphs are presented showing the distribution of radioactivity across the contact zones of this batholith.
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